Chapter 4 Hardware and Software Configuration 83
About Central Processing Unit
(CPU) Modules
The UltraSPARC III CPU module is a high-performance, highly-integrated
superscalar processor implementing the SPARC-V9 64-bit reduced instruction set
computer (RISC) architecture. The CPU module has been updated and improved to
further advance UltraSPARC’s reliability, availability, scalability, and serviceability
features.
The system’s main logic board provides slots for two UltraSPARC III CPU modules.
Each processor module includes one CPU chip with integrated cache memory for
data and instructions, as well as up to 8 Mbytes of external static random access
memory (SRAM) cache memory.
The CPU modules communicate with the system’s main memory and I/O
subsystem via the system’s high-speed data bus. The system CPU modules are
automatically synchronized with the system bus that runs at clock speeds up to 150
MHz providing maximum data throughput of 1.2 Gbytes per second.
A qualified service provider must remove and replace CPU modules in your system.
For information about installing and removing CPU modules, see the Sun Fire 280R
Server Service Manual.
Configuration Rules
The following rules apply for your system:
■ You can install one or two UltraSPARC III CPU modules into the server.
■ Insert the first CPU module into CPU slot 0 (J0501 and J0601).
■ Install two CPU modules into CPU slot 0 (J0501 and J0601) and into
CPU slot 1 (J0701 and J0801).
■ If you install more than one CPU module, the modules must operate at identical
clock speeds and they must have the same size cache memory. This generally
means the CPU modules must have the same part number.
For information about the CPU slot locations on the main logic board, see the Sun
Fire 280R Server Service Manual.
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